CHANGELOG.md

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# Changelog

All notable changes to vpn-switch are documented here. The format is based on
[Keep a Changelog](https://keepachangelog.com/), and the project aims to follow
[Semantic Versioning](https://semver.org/).

## [Unreleased] — towards 1.0.0

- The credentials file of OpenVPN documented end to end: the pin
  `VPN_SWITCH_CREDENTIALS_openvpn` in the manual's ENVIRONMENT and EXAMPLES,
  `@env` on `openvpn start` and `openvpn patch`, and a tutorial
  (TUTORIAL_OPENVPN.md): the two-line file outside the database, what a
  session keeps (the path), rotation when the provider reissues the VPN
  credentials, and that no export carries the file.
- `import` into a database that is not there makes it: the dump names its
  profile (new header line `# Profile:`), its signature is verified against
  the keyring the dump's own `openpgp add` record names (an absolute
  gnupghome that exists here, else the user's default keyring), the
  database is bootstrapped with that profile, the signer pinned under the
  record name the dump carries, the terminal interpreter pinned to `sh`
  (an import is asked for), then the import runs as always (`import
  bootstrap`, internal; `import` joins the commands that run without a
  database). The patch script `template/rescue/vpn-switch-import-db-patch.sh`
  (with the template tree under `lib/vpn-switch/template/rescue/`) builds
  a user's database into a rescue root for elebake's `stage rescue patch`:
  `sh <script> <user> <resources>`, as root inside the root (elebake puts a
  one-shot jail on it), `su -l` to the user: the signer's public key from
  `signer.asc` into the user's keyring, then `vpn-switch import`.
- The session block of a dump says what a saved session IS, in the user's
  own words: `<protocol> start <config>` then `session save <name>` (one
  start, one save per name), inside a guard that binds the connect
  terminals to `cat` -- the replay builds each session with its scripts
  and connects nothing -- and switches the environment cache back on after
  each pin change. The block of internal steps with the `"$$"` placeholder
  (`session create`/`populate`, `patch`, `configure`) is gone: it replayed
  the inner form of a session instead of describing one, and carried only
  the first. `sync` starts with `database init`, so a database older than
  the source gains the directories the pair needs (`export/`, `openpgp/`,
  `provenance/`); the pair's files are the owner's alone (dump, signature
  and bundle 0600). The root above the database (`VPN_SWITCH_ROOT`) now
  survives the re-exec and the batch environment.

- The export/import pair, ported from elebake: `export redacted|full|minimized <dump> <bundle>`
  writes the database as a dump plus a bundle of the files it names
  (configurations, openpgp records, receipts -- the strategy says which travel: redacted leaves the credentials at home, minimized the receipts), the bundle's MANIFEST
  attested and the dump sealed to the bundle and signed with the pinned
  OpenPGP key (`openpgp add`, `VPN_SWITCH_ARCHIVE_ATTEST_KEY`); `import
  <dump> <bundle>` verifies signer, seal and MANIFEST before anything
  lands, files a receipt (`provenance list`) and refuses a downgrade by
  serial. `restore` takes the same admissibility path, so an unsigned dump
  no longer replays. Dumps carry `# Version: 1` and `# Serial:`; their
  import lines name files against `"$VPN_SWITCH_ARCHIVE_BASE"`, which a
  plain restore binds to the database and an import to the extracted
  bundle. The dispatcher binds the longest anchor name first (`filter
  full a b` is `filter_full`/2, not `filter`/3) and the metadata
  generator keeps names with inner digits (`restore_v1`).

- FreeBSD rc.d: the devd `linkup` does nothing until the boot's own `start`
  has run (`/var/run/vpn_switch.started`): the uplink's LINK_UP is queued
  before devd runs, so `linkup` used to start the session before pf and the
  routes ("Firewall configuration failed") and `start` then ran it again
  (illyria 2026-09-18). Two starts at once (a flapping uplink) are
  serialized by the lock directory `/var/run/vpn_switch.lock`; the loser
  prints one line and returns 0.

The first public release. vpn-switch was developed privately from 2024 to 2026;
rather than replay that history commit by commit, this entry summarises the
capabilities present at 1.0.

### Added

**Boot integration (FreeBSD)**

- The rc.d service `vpn_switch` now does what its name promises: it brings
  the saved default session up at boot, ordered before `ntpdate`/`ntpd`/
  `openntpd` (a firewall that only lets the tunnel out leaves the time
  daemons without DNS until the VPN egress exists), after waiting for the
  uplink to have link and an address. A devd rule (`etc/devd/vpn_switch.conf`)
  calls `service vpn_switch linkup` whenever the uplink reports `LINK_UP`;
  both paths are no-ops while a session is connected.
- The service runs vpn-switch as the database owner. `gmake install`
  derives user, database (`~/.vpn-switch/db`) and uplink (default `lagg0`)
  from `SUDO_USER` and writes them to `etc/rc.conf.d/vpn_switch` once;
  `VPN_SWITCH_RC_USER` / `VPN_SWITCH_RC_IFNAME` override at install time.
  The previous placeholder script (credentials.txt under /data/vpn, a start
  that only ran `status`) is gone.

**Shell completion**

- `vpn-switch complete <words...>` prints completion candidates for a
  partially typed command line, derived from the `#@help` corpus: command
  words from the `@command` usages, placeholder values (configs, categories,
  sessions, variables, phases, profiles) from the database. New corpus tags
  `@defcompletion <placeholder> <source>` (one table in `include/help.sh`) and
  `@completion <placeholder> <source>` (per-command override); architecture
  test C fails if a usage placeholder has no source.
- `completion/vpn-switch.bash`: the bash side, a thin loop over that output,
  installed to `share/bash-completion/completions/vpn-switch` by `gmake
  install`. Existing databases pick up the display pin with `vpn-switch env
  sync`.
- Usage lines `helpenv [<name> [<location>]]` and `helpintp <fn> [<location>]`
  now write the layer placeholder in angle brackets like every other one.

**Protocols & connection**

- WireGuard and OpenVPN support behind a shared command surface.
- Protocol-agnostic `start` / `stop` / `status`. `start` auto-detects the
  protocol and, with no argument, resumes the default session or picks one at
  random.
- Patched WireGuard configs get `PersistentKeepalive` injected when the
  provider config sets none, so tunnels survive NAT rebinds and link flaps
  instead of staying silent until rebuilt by hand. Default 25 s, configurable
  via `VPN_SWITCH_KEEPALIVE_wireguard` (`0` disables, an explicit value in the
  config always wins).

**Configuration database**

- Filesystem-based config database with per-protocol `import`, `list`, `add`,
  `link`, `remove`, `validate`, `clean`, `info`, `patch`, and `dump`.
- Categories / groups and symlink aliases to organise many configurations.

**Sessions**

- Session caching: each connect writes a replayable `connect.sh` for instant
  reconnects.
- Named sessions — `session save` / `start` / `stop` / `show` / `list` /
  `remove` / `clean` — plus `session refresh` to reconcile interface ownership
  against the peers actually loaded.

**Database lifecycle**

- `bootstrap` / `init` with selectable profiles (minimal / all / custom).
- `dump` / `restore` / `batch` for portable backup and migration.
- `sync` (phases + env + version) and `version` drift detection against the
  installed source templates.

**Environment & customisation**

- Two-tier environment (`.env/default` + `.env/local`) via `setenv` / `getenv`
  / `unsetenv` / `printenv`, plus `environment cache` / `environment inspect`.
- Phase-based connect/disconnect scripts with a lifting engine and backend
  selection (firewall: pf / ipfw / iptables; DNS: resolvconf / unbound / …).
- Per-function interpreters — execute, display (dry-run), log, or replace any
  step by setting one variable.

**Diagnostics**

- `validate` with 12 sub-checks (each also runnable on its own), `inspect` for
  a full descriptive state dump, and `logs validate` / `logs clean`.

**Help & documentation**

- Generated help system: `vpn-switch help`, per-group and per-command help,
  rendered from in-source doc-blocks. The `vpn-switch(1)` man page COMMANDS
  section is generated from the same corpus, so help and the man page cannot
  drift apart.
- Install guide, quick-start / sessions / migration / troubleshooting tutorials,
  and architecture / design documentation.

**Platform & packaging**

- Pure POSIX `/bin/sh` — no language runtime, daemon, or third-party
  dependencies.
- Cross-platform install (FreeBSD rc.d service + Linux systemd unit template),
  FHS-compliant layout, and a `GNUmakefile` for build / install / test.

### Tested

- 1736 tests / 4734 assertions, green on FreeBSD and Debian, across unit,
  integration, and architecture suites.

[Unreleased]: https://github.com/enk-ode/vpn-switch